Patents by Inventor Johannes A. M. Scheepers

Johannes A. M. Scheepers has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • High-pressure sodium discharge lamp
    Patent number: 4958106
    Abstract: A circuit arrangement for operating a high-pressure sodium lamp is provided with two lamp connection points. The circuit arrangement comprises a controlled main switching element, a control electrode of which is connected to a control circuit. The circuit arrangement is provided with a measuring impedance in series with a lamp connection point and with a measuring impedance parallel to the lamp connection points. The measuring impedances are connected to the control circuit. A combination of a resistor and a capacitor is further connected to the control circuit and this combination is connected in series with one lamp connection point.
    Type: Grant
    Filed: January 24, 1989
    Date of Patent: September 18, 1990
    Assignee: U.S. Philips Corporation
    Inventors: Machiel A. M. Hendrix, Johannes A. M. Scheepers, Nicolaas H. G. Reijnders